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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ee8bb45e895061fe2865d205476a02b3fbdd5758f8bf840673a4f340791b92' 
  AND token = '+27p0c/8YMrzl4/VPHqaxD331wp9SUrtyz519e1RA28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}